Hello, syzbot found the following issue on: HEAD commit: c17cda15cc86 Merge tag 'net-6.6-rc8' of git://git.kernel.o.. git tree: bpf console+strace: https://syzkaller.appspot.com/x/log.txt?x=151ab177680000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d1f30869bb78ec6 dashboard link: https://syzkaller.appspot.com/bug?extid=756fe9affda890e892ae compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103b572b680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143a82c3680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d47cb341912c/disk-c17cda15.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f37f0cf41858/vmlinux-c17cda15.xz kernel image: https://storage.googleapis.com/syzbot-assets/e256afecf3c3/bzImage-c17cda15.xz The issue was bisected to: commit 32671e3799ca2e4590773fd0e63aaa4229e50c06 Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Date: Wed Oct 18 11:56:54 2023 +0000 perf: Disallow mis-matched inherited group reads bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10fdf71d680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12fdf71d680000 console output: https://syzkaller.appspot.com/x/log.txt?x=14fdf71d680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+756fe9affda890e892ae@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 32671e3799ca ("perf: Disallow mis-matched inherited group reads") general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 0 PID: 5052 Comm: syz-executor420 Not tainted 6.6.0-rc7-syzkaller-00089-gc17cda15cc86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:inherit_group kernel/events/core.c:13375 [inline] RIP: 0010:inherit_task_group.isra.0+0x248/0x5e0 kernel/events/core.c:13422 Code: 38 d0 7c 08 84 d2 0f 85 18 03 00 00 49 8d bf 8c 00 00 00 8b 9b 8c 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 eb RSP: 0018:ffffc90003b1fa48 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000011 RSI: ffffffff81b0fbc9 RDI: 000000000000008c RBP: ffff88801ce578a0 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: ffffffff8a60008b R12: 0000000000000000 R13: ffff88807532bb80 R14: ffffc90003b1fae0 R15: 0000000000000000 FS: 00007f07e8df36c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07e8df3fe8 CR3: 0000000078a1f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> perf_event_init_context kernel/events/core.c:13487 [inline] perf_event_init_task+0x330/0x740 kernel/events/core.c:13538 copy_process+0x242c/0x73f0 kernel/fork.c:2475 kernel_clone+0xfd/0x920 kernel/fork.c:2909 __do_sys_clone+0xba/0x100 kernel/fork.c:3052 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f07e8e324d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f07e8df3228 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f07e8ebc308 RCX: 00007f07e8e324d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f07e8ebc300 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07e8ebc30c R13: 0000000000000016 R14: 00007ffca721dd10 R15: 00007ffca721ddf8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:inherit_group kernel/events/core.c:13375 [inline] RIP: 0010:inherit_task_group.isra.0+0x248/0x5e0 kernel/events/core.c:13422 Code: 38 d0 7c 08 84 d2 0f 85 18 03 00 00 49 8d bf 8c 00 00 00 8b 9b 8c 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 eb RSP: 0018:ffffc90003b1fa48 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000011 RSI: ffffffff81b0fbc9 RDI: 000000000000008c RBP: ffff88801ce578a0 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: ffffffff8a60008b R12: 0000000000000000 R13: ffff88807532bb80 R14: ffffc90003b1fae0 R15: 0000000000000000 FS: 00007f07e8df36c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07e8e5ef20 CR3: 0000000078a1f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 38 d0 cmp %dl,%al 2: 7c 08 jl 0xc 4: 84 d2 test %dl,%dl 6: 0f 85 18 03 00 00 jne 0x324 c: 49 8d bf 8c 00 00 00 lea 0x8c(%r15),%rdi 13: 8b 9b 8c 00 00 00 mov 0x8c(%rbx),%ebx 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 eb test %ebp,%ebx --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
